code: def downgrade():
      op.drop_table(SqlLatestMetric.__tablename__)
  
file_path: mlflow/mlflow/store/db_migrations/versions/89d4b8295536_create_latest_metrics_table.py
imports: import time
  import logging
  from alembic import op
  from sqlalchemy import orm, func, distinct, and_
  from sqlalchemy import Column, String, ForeignKey, Float, BigInteger, PrimaryKeyConstraint, Boolean
  from mlflow.store.tracking.dbmodels.models import SqlMetric, SqlLatestMetric
label_desc: Use image node_id 4 for calling a global function with example usage: downgrade() without return types